lilypond-learning: Bar checks

 
 Bar checks
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 Though not strictly necessary, _bar checks_ should be used in the input
 code to show where bar lines are expected to fall.  They are entered
 using the bar symbol, ‘|’.  With bar checks, the program can verify that
 you’ve entered durations that make each measure add up to the correct
 length.  Bar checks also make your input code easier to read, since they
 help to keep things organized.
 
      g1 | e1 | c2. c'4 | g4 c g e | c4 r r2 |
      [image src="" alt="[image of music]" text="image of music"]
 
 
 See also
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    Notation Reference: See(lilypond-notation)Bar and bar number
 checks.